| abstract |
A catalyst for polymerization of olefins which comprises a vanadium compound of the formula:(where R<sup>1</sup> is an alkyl group or aryl group having 1 to 8 carbon atoms; and R<sup>2</sup> is an alkyl group or aryl group having from 1 to 8 carbon atoms, or hydrogen) and the organoaluminum compound of the formula R<sub>2</sub>AIX (where R is a hydrocarbon group having 1 to 8 carbon atoms, and X is a halogen atom). |